How to use a Huawei E3531 in Modem Mode

Install Raspbian Jessie

Download Raspbian Jessie and copy the image to your SD card, see Raspberry PI README for detailed installation instruction.

Install needed packages

apt-get install ppp usb-modeswitch usb-modeswitch-data

Add customized usb_modeswitch configuration

Create a file with name "12d1:1f01" in /etc/usb_modeswitch.d with following content

# Huawei E353 (3.se)

TargetVendor=  0x12d1
TargetProduct= 0x1f01 

MessageContent="55534243123456780000000000000011062000000100000000000000000000"
NoDriverLoading=1

Reboot the Raspberry Pi

sudo reboot

Verifing that the Modem Mode is active now

Run commmand

dmesg|grep USB

last lines of output should now show it attached to ttyUSBX

[  153.452085] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  153.452879] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  153.458673] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2

Add new interface "gprs"

Add the following 3 lines to file /etc/network/interfaces

auto gprs
iface gprs inet ppp
provider gprs

Add new provider "gprs"

Create new file 'grps' in /etc/ppp/peers with following content

user "emnify"
connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs -T em"
/dev/ttyUSB0
noipdefault
defaultroute
replacedefaultroute
hide-password
noauth
persist
usepeerdns

Bringing up the new interface manually (it will come up automatically on next boot)

ifup gprs

Monitoring the PPP connection

Mar 26 17:42:35 raspberrypi pppd[1783]: Serial connection established.
Mar 26 17:42:35 raspberrypi pppd[1783]: Using interface ppp0
Mar 26 17:42:35 raspberrypi pppd[1783]: Connect: ppp0 <--> /dev/ttyUSB0
Mar 26 17:42:37 raspberrypi pppd[1783]: Remote message: Greetings!!
Mar 26 17:42:37 raspberrypi pppd[1783]: PAP authentication succeeded
Mar 26 17:42:37 raspberrypi pppd[1783]: Could not determine remote IP address: defaulting to 10.64.64.64
Mar 26 17:42:37 raspberrypi pppd[1783]: replacing old default route to eth0 [192.168.10.1]
Mar 26 17:42:37 raspberrypi pppd[1783]: local  IP address 10.199.0.67
Mar 26 17:42:37 raspberrypi pppd[1783]: remote IP address 10.64.64.64
Mar 26 17:42:37 raspberrypi pppd[1783]: primary   DNS address 8.8.8.8
Mar 26 17:42:37 raspberrypi pppd[1783]: secondary DNS address 8.8.4.4

Source at GitHub

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